Just like everything else in life, if you want to do something the right or proper way, you have to know the basics in order to succeed. You cannot add up 100+100 until you know that 1+12. The same goes for finding your first job in high school; you got to have the basics.
A friend of mine has been a headhunter and career counseling for more than 2 decades, and she has come to a realization and conclusion that if appropriate career counseling is done or attained successfully in high school, career change or job loss in the near future will not be as traumatic as it has been for either experienced executives or teenagers.
Networking is just a natural part of life for instance, when you go to a movie and tell your buddy how good it was, your friend will go to see it based on your recommendation. Now, after your friend sees the movie and likes it too, your friend tells another pal and so on.